c# - 如何在C#中读取图像和文本值？

Question

如您所见，我正在尝试通过 POST 命令将图像和名称发送到本地函数。

如何在 C# 中读取这两个参数？

这是我尝试过的，但它只能读取文件图像。

   [FunctionName("Test")]
public static async Task<HttpResponseMessage> 
     Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = 
 null)]HttpRequestMessage req, TraceWriter log)
{
    //Check if the request contains multipart/form-data.
    if (!req.Content.IsMimeMultipartContent())
    {
        return req.CreateResponse(HttpStatusCode.UnsupportedMediaType);
    }


  foreach (var stream in contents.Contents)
    {


        try
        {
            var fileBytes = await stream.ReadAsByteArrayAsync();
            var fileinfo = new FileInfo(stream.Headers.ContentDisposition.FileName.Trim('"'));



         //Can Read File image like this.


        }
        catch(Exception e)
        {
            return req.CreateErrorResponse(HttpStatusCode.Conflict, e);
        }

Answer 1

Is there a workaround to do this like using memory stream?

根据您的要求，我假设您可以使用HttpContentMultipartExtensions.ReadAsMultipartAsync您将获得 MultipartMemoryStreamProvider，然后您可以利用以下代码来读取上传的文件:

var multipartMemoryStreamProvider= await req.Content.ReadAsMultipartAsync();
foreach (HttpContent content in multipartMemoryStreamProvider.Contents)
{  
   // for reading the uploaded file
   var filename= content.Headers.ContentDisposition.FileName.Trim('"');
   var stream=await content.ReadAsStreamAsync();          

   //for formdata, you could check whether `content.Headers.ContentDisposition.FileName` is empty
   log.Info($"name={content.Headers.ContentDisposition.Name},value={await content.ReadAsStringAsync()}");
}

此外，您可以关注此issue关于基于 MultipartMemoryStreamProvider 创建自定义 MultipartFormDataMemoryStreamProvider。还有这个issue关于基于 MultipartStreamProvider 构建自定义 InMemoryMultipartFormDataStreamProvider。